Advanced experimental techniques make quantum optics one ofthe most active fields in probing the fundamental laws ofquantum theory. The contributions collected in this volume,by both theoreticians and experimentalists, give an overviewof the most recent developments in fundamental quantumoptics. Of particular interest is the physics of cooled andtrapped particles. Other topics include atomicinterferometry, quantum electrodynamics in a cavity, quantummeasurement and much more. The level of presentation makesthis book intelligible not only to the expert but also to awide readership from engineering and physics.